xxhash for ctrl layer

src/ctrl/ctrl_core.c

@@ -9,14 +9,16 @@
 ////////////////////////////////
 //~ rjf: Basic Type Functions
 
+#if !defined(XXH_IMPLEMENTATION)
+# define XXH_IMPLEMENTATION
+# define XXH_STATIC_LINKING_ONLY
+# include "third_party/xxHash/xxhash.h"
+#endif
+
 internal U64
 ctrl_hash_from_string(String8 string)
 {
-  U64 result = 5381;
-  for(U64 i = 0; i < string.size; i += 1)
-  {
-    result = ((result << 5) + result) + string.str[i];
-  }
+  U64 result = XXH3_64bits_withSeed(string.str, string.size, 5381);
   return result;
 }